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Amplified circularly polarized phosphorescence from co-assemblies of platinum(II) complexes

Title
Amplified circularly polarized phosphorescence from co-assemblies of platinum(II) complexes
Authors
Park, GyurimKim, HyungchaeYang, HoichangPark, Kyung RyoulSong, InhoOh, Joon HakKim, ChangsoonYou, Youngmin
Ewha Authors
유영민
SCOPUS Author ID
유영민scopus
Issue Date
2019
Journal Title
CHEMICAL SCIENCE
ISSN
2041-6520JCR Link

2041-6539JCR Link
Citation
CHEMICAL SCIENCE vol. 10, no. 5, pp. 1294 - 1301
Publisher
ROYAL SOC CHEMISTRY
Indexed
SCI; SCIE; SCOPUS WOS
Document Type
Article
Abstract
Molecules capable of producing zero-field circularly polarized phosphorescence (CPP) are highly valuable for chiroptoelectronic applications that rely on triplet exciton. However, the paucity of tractable molecular design rules for obtaining CPP emission has inhibited full utilization. We report amplification of CPP by the formation of helical co-assemblies consisting of achiral square planar cycloplatinated complexes and small fractions of homochiral cycloplatinated complexes. The latter has a unique Pfeiffer effect during the formation of superhelical co-assemblies, enabling versatile chiroptical control. Large dissymmetry factors in electronic absorption (g(abs), 0.020) and phosphorescence emission (g(lum), 0.064) are observed from the co-assemblies. These values are two orders of magnitude improved relative to those of individual molecules. In addition, photoluminescence quantum yields (PLQY) also increase by a factor of ten. Our structural, photophysical, and quantum chemical investigations reveal that the chiroptical amplification is attributable to utilization of both the magnetically allowed electronic transition and asymmetric coupling of excitons. The strategy overcomes the trade-off between glum and PLQY which has frequently been found for previous molecular emitters of circularly polarized luminescence. It is anticipated that our study will provide new insight into the future research for the exploitation of the full potential of CPP.
DOI
10.1039/c8sc04509g
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엘텍공과대학 > 화학신소재공학전공 > Journal papers
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